docstr: Read an item in the reader.
docstr_tok: ["Read","an","item","in","the","reader","."]
code: def __getitem__(
      self, index: Union[int, ChunkedIndex]
  ) -> Dict[str, Any]:
      """Read an item in the reader."""
      if isinstance(index, int):
          index = ChunkedIndex(
              index, self._get_chunk_index_from_index(index)
          )
      return self._reader.read(index)
  
imports: import logging
  import os
  from dataclasses import dataclass
  from typing import Any, Dict, List, Optional, Tuple, Union
  from lightning.data.streaming.constants import _INDEX_FILENAME, _LIGHTNING_CLOUD_LATEST, _TORCH_GREATER_EQUAL_2_1_0
  from lightning.data.streaming.item_loader import BaseItemLoader
  from lightning.data.streaming.reader import BinaryReader
  from lightning.data.streaming.sampler import ChunkedIndex
  from lightning.data.streaming.serializers import Serializer
  from lightning.data.streaming.writer import BinaryWriter
  from lightning.data.utilities.env import _DistributedEnv, _WorkerEnv
  from lightning.data.utilities.format import _convert_bytes_to_int
label_desc: Use image node_id 9 for calling the Cache obj's underlying member method code with example usage: obj.__getitem__(index) and returns: self